在“岂为空谷足音,故见之而喜欤”中,“空谷足音”之喻义为()
A.喻荒凉
B.喻冷落
C.喻寂寞
D.喻难得遇见的人和物
参考答案:D
超声测量正常成人胆囊的前后径一般不超过()。
A.2.0cm以下
B.2.5cm
C.3.0cm
D.3.5cm
E.4.0cm以上
School students _______ smoke because it is against the school rules.[ ]
A. needn't
B. couldn't
C. won't
D. mustn't